Hey @TeamYouTube why do I get ads like this I'm not even an American, can I get my free vbucks ads again? 

pic.twitter.com/xxejq5U7uR
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There clearly not biased toward extremist/zealots on either side (unless they get called out to many times). Like most groups these days they seem biased primarily against those that refuse to go radical right or radical left (though they do lean a bit more left).